Older Automakes give this error without this directive:
Makefile.am: C objects in subdir but `AM_PROG_CC_C_O' not in `configure.ac'
In newer autotools this is included under AC_PROG_CC, but it's harmless
to add.
https://github.com/xkbcommon/libxkbcommon/issues/3
Signed-off-by: Ran Benita <ran234@gmail.com>
XORG_ENABLE_DOCS
XORG_WITH_DOXYGEN
+# Needed in older Automakes for subdir-objects
+AM_PROG_CC_C_O
+
# Check for compiler features
AC_C_INLINE